rename all psuedo-pngs as jpg
Apparently there were several images that were name pngs while they were actually jpegs. Closes: https://gitlab.lcsb.uni.lu/R3/kanban/board/-/issues/436
Apparently there were several images that were name pngs while they were actually jpegs. Closes: https://gitlab.lcsb.uni.lu/R3/kanban/board/-/issues/436